<form action="" class="noprint">
<input id="print_button" {if $btn_image}type="image" src="{$smarty.const.URL_IMAGES}/printer-icon.gif"{else}type="button"{/if} value="{lbl_btn_print}" alt="{lbl_btn_print}" title="{lbl_btn_print}" onclick="window.print();return false;"/>
</form>